High-strength high-carbon steel wire rod and production method thereof

The invention provides a high-strength high-carbon steel wire rod and a production method thereof. The high-strength high-carbon steel wire rod comprises the following components by weight percentage: 0.85%-0.90% of C, 0.1%-1.0% of Si, 0.3%-1.0% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, less than or equal to 0.0010% of Ti and the rest Fe. The production method comprises the following steps of: 1), smelting: preprocessing molten iron, controlling sulfur to be less than 0.005%, and feeding less than or equal to 0.040% of Ti into a convertor, wherein the smelting final-point phosphorus content of the convertor is less than or equal to 0.010%, the final-point molten steel temperature of the convertor is at 1,570-1,680 DEG C, the refining process temperature is at 1,530-1,625 DEG C, and the refining time is for 20-50minutes; 2), continuous casting: adopting a large square ingot for the continuous casting, wherein the tundish molten steel superheating temperature is not more than 30 DEG C; and 3), continuous rolling and wire rod rolling, wherein the diameter of the wire rod is 5.5-8.0mm, the laying temperature is 870-910 DEG C, the sorbite transformation process temperature of the wire rod is controlled at 640-600 DEG C, the transformation time is controlled at 7-12seconds, and the sorbite transformation process average supercooling temperature of the wire rod is controlled at 60-80 DEG C. Due to the adoption of the high-strength high-carbon steel wire rod disclosed by the invention, the tensile strength can reach 1,200 MPa-1,300MPa, and the area reduction index is not less than 30%.